Please refer to the links below from our help files guiding you on how to attach accounts to a CT600 return;
https://taxfiler.co.uk/support/trasnferring-accounts-to-ct600/ - Video link
https://taxfiler.co.uk/support/attaching-accounts-to-ct600-return/ - link with images
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If you still need help, please email support@taxfiler.co.uk